Why are fundies so afraid of atheists?

Deep down, they know they don't really have a god.

I will admit that pretentious atheists could bore an accountant to death, but that is because atheists are such boring people.  Have you ever seen an atheist who was normal? 

I will admit that atheists come up way below minimums for GCT, ASFAB, and all other entrance examinations, but that is due to the fact that atheist programming makes them so dull that no one wants to be within a few miles of them.

Atheists all set fire to Christians and eat their kidneys. Have you ever met an atheist that doesn't do this? They will find out that the good Lord will punish them using eternal fire in a gulag with Stalin. Atheist programming mean they won't believe in our talking snakes, but they will see Jesus himself very soon.

Why must theist cannibals like me always be so disagreeable? 
It is because I am a fanatical cannibal, devoted to my cult as bitterly as a Muslim suicide bomber.  Cannibals like me must always go out of their way to be absolutely disagreeable but that is what we get for eating out on atheists. Sheer mindless folly.
Pity us morons, as ours is the last crackpot cult on the planet, which of course is as humorless, ignorant, vulgar, and sick, as the Eat Agains, Jehovah's cannibals and the Gourmons.

1 ) Because they are so invested in their religious doctrine, that any perceived rejection of that doctrine is seen as a personal rejection of them as a person.
and 2 ) As JH said. They are so scared that they are wrong, that they have to scream over their own insecurity.

People who are secure in their faith fear nothing, and don't feel the need to insult and bully others.
Renner will no doubt be along shortly to prove my right.